RBOT improvement

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Can RBOT number be improved by adding fresh oil , 10% of total quantity in the tank.Recent analysis showed a...

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Posted by Javed Mateen (Discussions: 1, Comments: 0)
Replied on April 9, 2017 12:00 am
Category: Used Oil Analysis
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Probably a higher concentration of anti-oxidants in the fresh charge with do the trick ;)
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Posted by Farrukh Jamal (Discussions: 0, Comments: 3)
Replied on April 8, 2017 8:00 pm
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RPVOT (formerly known as RBOT) measurement is an indirect method of measuring Oxidation stability of turbine oils with a lot of variation in RPVOT results between labs, testing equipment and the procedure used by the operator. There are other methods that are more direct methods of measuring Oxidation and should be preferably used.
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Posted by Mohammad Naseer Uddin, CMRP, MLA-ll (Discussions: 1, Comments: 1)
Replied on April 8, 2017 8:00 pm
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In the case of highly additivated oils like engine oil in a DGSet/ Dieselled Power Plant using poor distillates, "sweetening"
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Posted by Hussam Adeni (Discussions: 0, Comments: 9)
Replied on April 9, 2017 8:00 pm
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is a standard practice to deal with increasing Sulphur in the fuels, and thereby correct the TAN of the Lube oil.
The oxidation impact could be lower.
In the case of mildly additivated Lubricant like Turbine oil, the impact on oxidation with "sweetening" with 10% would certainly by higher.
To add to the complication is the erratic figure generated by RVBOT , as indicated by Naseeruddin.
This can only be validated by real data.
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Posted by Hussam Adeni (Discussions: 0, Comments: 9)
Replied on April 9, 2017 8:00 pm
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Sweetening can be done and effective if you are trying to keep machine running until a turnaround. Realize it is a band aid. Once oil becomes oxidized it become a catalyst in speeding up the process. That is why when dealing with oxidized oil you need to do a thorough drain and purge during the changeout. Hope this helps.
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Posted by Larry Jordan (Discussions: 0, Comments: 1)
Replied on April 10, 2017 8:00 pm
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What type of oil being used? What is the application? Agree with all comments, "sweetening" or bleed and feed is viable, but Larry is correct, it is a band aid for what could be a system issue, or a wrong oil used for the application. Really need to know more about the whole system and fluid chosen to assess properly. But it can be done, a higher concentration of new oil would benefit more.
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Posted by Ross Kovanda (Discussions: 0, Comments: 3)
Replied on April 10, 2017 8:00 pm
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used turbine oil contains acid and oxidized products.when you add fresh oil you really add antioxidation and some other additives but acids and oxidation products are remained.these materials accelerate the aging of whole oil and damage the equipements at long periods.cost of maintenance is greater than cost of whole oil changing
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Posted by mohammad sabzalian (Discussions: 0, Comments: 2)
Replied on April 11, 2017 8:00 pm
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I would agree with Larry on this point.
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Posted by Keith Smith (Discussions: 0, Comments: 1)
Replied on April 11, 2017 8:00 pm
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Agree with the comments, specially with the band-aid comparison. The used oil will indeed act as a catalyst and will accelerate fresh oil degradation. All sub-products will continue to be generated and will affect overall performance. You may use some sophisticated filtration equipment which may help reduce undesirable elements in the lubricant, the equipment manufacturers (I´m sure some reps are in this group) can assist on finding a suitable cost-effective solution.
Get a good lab to preform the RPVOT & Ruler tests.
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Posted by Daniel Ríos (Discussions: 0, Comments: 1)
Replied on April 11, 2017 8:00 pm
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Javed Mateen, Probably a good idea to consider other parameters that can be resolved with additions such as viscosity. Guessing this is a turbine and you are potentially risking lacquer at this point.
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Posted by Mark Fretz (Discussions: 0, Comments: 6)
Replied on April 12, 2017 8:00 pm
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Every oil is its running hours, You can add antioxidant in the reservoir, premixed in the oil in use.
Play Safe:
Oil is the cheapest in terms of monetary value compared to the Turbine cost. Always change on the prescribed running hours as recommended by the supplier & do periodic testing which will enable you to change on time without ant hassle.
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Posted by Muqtadir Ur Rehman (Discussions: 0, Comments: 1)
Replied on April 13, 2017 8:00 pm
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Hello Javed - In some cases, replenishing the antioxidant package of in-service turbine oils is a viable option. The advantage is that it is more cost-effective and requires significantly less volume to restore the antioxidants (<1% of the formulation) compared to bleed-and-feed. It's not appropriate for all turbine oils and significant testing is required up-front. When proper qualification testing is performed however, the risks of replenishing the depleted antioxidants can be lower than a traditional oil change and flush. Antioxidant replenishment should also coupled with a technology that can effectively remove oxidation by-products and other reactive degradation products. Here's a video of the process being done at a power plant: https://www.youtube.com/watch?v=L2LlH2qt-Q0&t=1s
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Posted by Greg Livingstone (Discussions: 0, Comments: 2)
Replied on April 16, 2017 8:00 pm
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Hello, adding some fresh oil helps indeed by lowering the total acidity .But to stop or disaccelerating the chain reaction started in the base stock you need to add some antioxidant who will be the "sacrifice" there and will stabilize the active radicals which are key in the base stock oxidation.Good luck.
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Posted by Denisa Ivana (Discussions: 0, Comments: 14)
Replied on April 18, 2017 8:00 pm
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May be I can be of your assistance.
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Posted by Muhammad Hassan Abbasi (Discussions: 0, Comments: 2)
Replied on April 19, 2017 8:00 pm
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